Dead Zones, or hypoxic areas, are aquatic regions with low oxygen content, primarily due to nutrient pollution by humans. The oxygen zapping pollutants render the areas unlivable for much marine life. Hypoxia can be coastal, or it can occur in major lakes and rivers due to agricultural pollution, such as fertilizer run-off, and make its way outwards towards coastal ocean waters.

[392] Dead Zones, 2013

Dead Zones, or hypoxic areas, are aquatic regions with low oxygen content, primarily due to nutrient pollution by humans. The oxygen zapping pollutants render the areas unlivable for much marine life. Hypoxia can be coastal, or it can occur in major lakes and rivers due to agricultural pollution, such as fertilizer run-off, and make its way outwards towards coastal ocean waters.